Come and enjoy Doha! Just buy your visa at the immigration queue at arrivals (with a credit card only) good for 30 days. Feels free to wander and certainly try wearing an abaya! The only time I really dicker here is over gold and the gold salespeople here are so awful I haven't bought any, I wait until I'm in Dubai. Fabrics are nice, spices are wonderful, food is good. You should have no trouble at all. If you are bothered by someone who is attracted to a single woman just ignore them. Enjoy the souk certianly but don't miss the malls. The juxtaposition of traditional and modern is always irresistable to me. And don't forget the museum!